将 kotlin 多平台库发布到 Maven Central（InvalidMavenPublicationException multiple artifacts with the same ...）

似乎问题出在此行 artifact(tasks["sourcesJar"]) 中，因为此任务已包含在内。
在这里，我想放置用于将 kotlin 多平台库上传到 Maven Central 的工作脚本。
首先，我们需要注册 Sonatype 帐户，验证我们的域等，这里是一个 fresh article with detailed steps。
那么您的项目脚本 build.gradle.kts 可能如下所示：

import java.io.FileInputStream
import java.util.Properties
import org.gradle.api.publish.PublishingExtension

plugins {
    id("kotlin-multiplatform")
    id("org.jetbrains.dokka") version "1.4.0-rc"
    id("io.codearte.nexus-staging") version "0.22.0"
    `maven-publish`
    signing
}

enum class OS {
    LINUX,WINDOWS,MAC
}

fun getHostOsName(): OS =
    System.getProperty("os.name").let { osName ->
        when {
            osName == "Linux" -> Os.LINUX
            osName.startsWith("Windows") -> Os.WINDOWS
            osName.startsWith("Mac") -> Os.MAC
            else -> throw GradleException("Unknown OS: $osName")
        }
    }

kotlin {
    sourceSets {
        jvm()
        js() {
            browser()
            nodejs()
        }
        when (getHostOsName()) {
            Os.LINUX -> {
                linuxX64()
                linuxArm64()
            }
            Os.WINDOWS -> {
                mingwX64()
            }
            Os.MAC -> {
                macosX64()
                iosArm64()
                iosX64()
            }
        }

        val commonMain by getTing {
            dependencies {
                implementation(kotlin("stdlib-common"))
                implementation(Libs.olekdia.common)
            }
        }
        val commonTest by getTing {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-Annotations-common"))
            }
        }
        val jvmMain by getTing {
            dependencies {
            }
        }
        val jvmTest by getTing {
            dependencies {
                implementation(kotlin("test"))
                implementation(kotlin("test-junit"))
            }
        }
        val jsmain by getTing {
            dependencies {
            }
        }
        val nativeMain by creaTing {
            dependsOn(commonMain)
        }
        when (getHostOsName()) {
            Os.LINUX -> {
                val linuxX64Main by getTing {
                    dependsOn(nativeMain)
                }
                val linuxArm64Main by getTing {
                    dependsOn(nativeMain)
                }
            }
            Os.WINDOWS -> {
                val mingwX64Main by getTing {
                    dependsOn(nativeMain)
                }
            }
            Os.MAC -> {
                val macosX64Main by getTing {
                    dependsOn(nativeMain)
                }
                val iosArm64Main by getTing {
                    dependsOn(nativeMain)
                }
                val iosX64Main by getTing {
                    dependsOn(nativeMain)
                }
            }
        }
    }
}


tasks {
    create<Jar>("javadocJar") {
        dependsOn(dokkaJavadoC)
        archiveClassifier.set("javadoc")
        from(dokkaJavadoc.get().outputDirectory)
    }

    dokkaJavadoc {
        dokkasourceSets {
            create("commonMain") {
                displayName = "common"
                platform = "common"
            }
        }
    }
}

//--------------------------------------------------------------------------------------------------
//  Publishing
//--------------------------------------------------------------------------------------------------

val fis = FileInputStream("local.properties")
val properties = Properties().apply {
    load(fis)
}
val ossUser = properties.getProperty("osS.User")
val osspassword = properties.getProperty("oss.password")
extra["signing.keyId"] = properties.getProperty("signing.keyId")
extra["signing.password"] = properties.getProperty("signing.password")
extra["signing.secretKeyRingFile"] = properties.getProperty("signing.secretKeyRingFile")

val libraryVersion: String by project
val publishedGroupId: String by project
val artifactName: String by project
val libraryName: String by project
val libraryDescription: String by project
val siteUrl: String by project
val gitUrl: String by project
val licensename: String by project
val licenseUrl: String by project
val developerOrg: String by project
val developerName: String by project
val developerEmail: String by project
val developerId: String by project

project.group = publishedGroupId
project.version = libraryVersion

signing {
    sign(publishing.publications)
}

afterEvaluate {
    configure<PublishingExtension> {
        publications.all {
            val mavenPublication = this as? MavenPublication
            mavenPublication?.artifactId =
                "${project.namE}${"-$name".takeUnless { "kotlinMultiplatform" in name }.orEmpty()}"
        }
    }
}

publishing {
    publications.withType(MavenPublication::class) {
        groupId = publishedGroupId
        artifactId = artifactName
        version = libraryVersion

        artifact(tasks["javadocJar"])

        pom {
            name.set(libraryName)
            description.set(libraryDescription)
            url.set(siteUrl)

            licenses {
                license {
                    name.set(licenseName)
                    url.set(licenseUrl)
                }
            }
            developers {
                developer {
                    id.set(developerId)
                    name.set(developerName)
                    email.set(developerEmail)
                }
            }
            organization {
                name.set(developerOrg)
            }
            scm {
                connection.set(gitUrl)
                developerConnection.set(gitUrl)
                url.set(siteUrl)
            }
        }
    }

    repositories {
        maven("https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
            name = "sonatype"
            credentials {
                username = ossUser
                password = osspassword
            }
        }
    }
}

nexusStaging {
    username = ossUser
    password = osspassword
    packageGroup = publishedGroupId
}

在 gradle.properties 中提供所需的库详细信息：

libraryVersion = 0.1.1
libraryName = Your library name
libraryDescription = Your library description
publishedGroupId = com.yourdomain
artifactName = your-cool-librayr
siteUrl = https://gitlab.com/yourlibrayr
gitUrl = https://gitlab.com/yourlibrayr.git
developerId = ...
developerOrg = ...
developerName = Your Name
developerEmail = yourmail@mail.com
licensename = The Apache Software License,Version 2.0
licenseUrl = http://www.apache.org/licenses/LICENSE-2.0.txt
allLicenses = ["Apache-2.0"]
kotlin.mpp.enableGranularsourceSetsMetadata = true
gnsp.disableApplyOnlyOnRootProjectEnforcement = true

此处需要声明 gnsp.disableApplyOnlyOnRootProjectEnforcement = true in subprojects 的 nexusStaging 属性。
最后把你的功劳记在local.properties上：

osS.User=your_user_name
oss.password=your_pass
signing.keyId=last_8_numbers_of_key
signing.password=your_pass
signing.secretKeyRingFile=/path/to/keystorage.gpg

现在在项目目录中发布开放终端：

./gradlew build
./gradlew publish
./gradlew closeAndReleaseRepository

• 您可以跳过最后一个命令，并从 Nexus repository manager 关闭和释放暂存包。该 nexus-staging 插件只需从命令行执行即可。
• 我尝试将脚本的发布部分移动到单独的文件中，并将其包含在 apply(from = "publish.gradle.kts") 中，但它不起作用，因为它在单独的文件中丢失了上下文
• 我使用旧版本的 dokka 库 (1.4.0-rC)，因为新版本无法为所有平台生成 javadoc。存储库需要此 javadoc 才能发布。作为 authors mentioned，我们可以为此生成空的 javadoc.jar 文件。